What divided by 125 will get me 45

Which equation represents a proportional relationship that has a constant of proportionality equal to 1/5

Sienna planned a trapezoid-shaped garden, as shown in the drawing below. she decides to change the length of the top of the trapezoid-shaped garden from 32 ft to 24 ft. which expression finds the change in the scale factor?

Cody was 165cm tall on the first day of school this year, which was 10% taller than he was on the first day of school last year.